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Debt - Amended Credit Agreement (Details) - Unsecured Debt - Delayed-Draw Term Loan Credit Facility
12 Months Ended
Sep. 26, 2019
USD ($)
Sep. 11, 2019
Apr. 05, 2019
USD ($)
Dec. 31, 2019
USD ($)
borrowing
Dec. 31, 2018
USD ($)
Line of Credit Facility [Line Items]          
Maximum borrowing capacity       $ 5,000,000,000.0  
Credit facility, term   364 days      
Maximum number of borrowings | borrowing       4,000,000,000  
Borrowings outstanding         $ 2,000,000,000.0
Weighted average interest rate         3.34%
Proceeds from additional drew down on credit facility     $ 500,000,000    
Repayments on termination of credit facility $ 2,500,000,000        
Interest expense and fees       $ 69,000,000 $ 72,000,000
London Interbank Offered Rate (LIBOR)          
Line of Credit Facility [Line Items]          
Basis spread on variable rate         1.125%